Oil-pump



A. J. LEWIS.

(Model.)

OIL PUMP.

Patented Deo. 20, 18 81'...

INVENTOR ATTORNEYS.

s. Pham-mmm@ UNITED STATES PATENTl OFFICE.

ALFRED J. LEWIS, OF BARNHARTS MILLS,VASSIGN0R TO HIMSELF AND JESSE A. HEYDRIGK, AOF MILLERSTOWN, PENNSYLVANIA.

OIL-PUMP.

SPECIFICATION forming part of Letters Patent No. 251,256, dated December 20, 1881. Application filed April 23, 1881. (Model.)

T 0 all whom it may concern Be it known that I, ALFRED JOHN LEWIS, a citizen of the United States, residing at Barnharts Mills,in the county of Butler and State of Pennsylvania, have invented a new and useful Improvement in Oil-Pumps, of which the 'following is a full, clear, and exact description,

reference being had to the drawings hereto an nexed.

The object of my invention is to provide a vacuum -pump for oilwells which shall be adapted for agitating theoil, to keep all passagesfeeding or supplying said pump freefrom the accumulation of sediment, paraffine, salt, or other obstructions, and to dispense with the ordinary inlet-valves, which are liable to get out of order.

In the accompanying drawings, Figure 1 represents a longitudinal section of the pumpchamber with the tubing above broken away, and Fig. 2 a perspective of the same with the tubing partly broken away; and Figs. 3 and 4, detail views, showing a vertical section and end views of the plug and its attachments.

In constructing my invention I employ an ordinary cylindrical piston-chamber, A, of any desired size or length, which I provide with one or more perforations, a, arranged inl any desirable order near its central portion, so as to leave sufficient room above for the vacuum. This chamber is provided with screw-th readed ends in order that it may be removably attached to other parts ofthe pump mechanism, and thereby be capable of being reversed end for end.

To the lower end of the chamber is screwed an attachment, b, which serves as a support for the said chamber, and is provided with an `interior collar, b', upon which the piston rests when detached from the motive power. This attachment or support is also provided with a number ofperforations, b2, for the egress and ingress of the fluid when forced down by' the pistop. To the upper end of said pistonchainber is screwed a coupling-joint, c, for attaching suit-able tubing by which the fluid is to be conveyed above ground,` and within said end is secured a )lnor c havinacentral erforation for the piston-rod d, and provided witha number of vertical perforations, c2, for the upward escape of the fluid when lifted by the piston. The upper portion of said plug is eu- 4circled by a metallic band, e, which is provided with horizontal perforations e", leading into the said tubing, and having an interior collar, e2, at its upper end, for retaining in position a shouldered packing, e3, which is made of metal or other suitable material, and so constructed that it may have vertical movement upon the piston-rod, whereby. it may expand or rise when the fluid is lifted and allow the same to pass out at the perforations e in the band e into the tubing above.

The piston d I prefer to make solid, with a concave head on the lower end; but it may be made with a valve, if so desired.

It will be seen that with an open pistonchamber, asabove described, the downward stroke of the piston will cause the uid to escape through the perforations atany point below the piston with such force as to agitate the entire contents of the well. In this manner all accumulati-ons ofsediinent, &c., about the pump orifices will be effectually prevented. As the piston descends the vacuum above is filled as soon as the piston passes the orifices in the chamber, and the fluid i`s lifted by successive upward strokes into the tubing until it escapes above ground.

It is evident that'my invention secures a great advantage in dispensing with the usual valves, which are liable to get out of order. I'

do not limit myself to the peculiar form above described, for my invention may be variously modified so as`to secure ,the same objectnamely, the receiving the fluid to be pumped without the necessity of its passing through valves before being taken up by the piston or forcing power.

It is also evident that my invention may be used for pumping not only iiuids of all kinds, but also air or gases.

Having thus described myinvention,wl1at I claim as new, and desire to'secure by Letters Patent, is-

1. An agitating vacuum-pump having a per forated piston-chamber, in combination with a piston and a perforatedfplng7 substantially as shown and described.

as shown and described, whereby the contents ofthe Well may be agitated and the use of check-valvesv dispensed with, asset forth. I5

4. In combination with the perforated piston-chamber A and piston d, the plug c', having vertical perforations c2, metallic band e, having horizontal perforations e', and interior collar, e2, and expansble shouldered packing 2o e3, substantially as shown and described.

ALFRED JOHN LEWIS.

Witnesses GEO. W. HUsELToN, W. B. BYERs. 

